APA (7th ed.) Citation

Hansen, W. R., & Rowley, P. D. (1980). Geologic map of the Hells Canyon quadrangle, Moffat County, Colorado. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Hansen, Wallace R., and Peter D. Rowley. Geologic Map of the Hells Canyon Quadrangle, Moffat County, Colorado. Reston, Va.: U.S. Geological Survey, 1980.

MLA (8th ed.) Citation

Hansen, Wallace R., and Peter D. Rowley. Geologic Map of the Hells Canyon Quadrangle, Moffat County, Colorado. U.S. Geological Survey, 1980.